////////////////////////////////////////////////////////////////////////
/// \class RAT::VertexGen_DecayChain
///
/// \brief This file is a modified copy of DecayChain_Gen.hh and is used to
///        generate decay chains in a vertex.
///
/// \author Eric Vazquez-Jauregui <ericvj@fisica.unam.mx> -- contact person
/// \author Logan Sibley <lsibley@ualberta.ca>
///
/// REVISION HISTORY:\n
///     01 Jan 2010 : Eric Vazquez-Jauregui
///     26 Jul 2010 : Logan Sibley - Changes to accommodate the screening
///                   correction in DecayChain_Gen. \n
///     12 Aug 2010 : Logan Sibley - Enable the handing of positron emission/
///                   electron capture. \n
///     28 Sep 2010 : Logan Sibley - Enable proper handling of gamma decay \n
///     03 Jan 2013 : Logan Sibley - Now adds parent info into DS
///     04 Aug 2015 : Matt Mottram - Use G4IonTable to get ions
///
/// \details Generates a decay chain to be added in a vertex similar to the
///         decay chain top-level generator. It may be used with combo or
///         coincidence top-level generators with the same commands, but in a
///         vertex:
///       /generator/vtx/set ISOTOPE
///
///         The ISOTOPE parameter may be any chain or element found in the file
///         beta_decays.dat (see decay chain top-level generator). To start a
///         chain from an isotope use:
///       /generator/vtx/set ISOTOPE:midchain
///         If you require the ISOTOPE to alpha decay, use:
///       /generator/vtx/set ISOTOPE:alpha
///         If you require the ISOTOPE to gamma decay, use:
///       /generator/vtx/set ISOTOPE:gamma
///
///         To apply a screening correction to the beta energy spectrum use:
///       /generator/vtx/set ISOTOPE::screen
///         If SCREEN is not specified, or is set to 'none', the screening
///         correction will not be used. You may also specify midchain, if
///         required.
///
////////////////////////////////////////////////////////////////////////

#ifndef __RAT_VertexGen_DecayChain__
#define __RAT_VertexGen_DecayChain__

#include <RAT/GLG4VertexGen.hh>
#include <RAT/DecayChain_Gen.hh>

#include <globals.hh>
#include <RAT/GLG4Gen.hh>

/**
    \class VertexGen_DecayChain
    for decay chain in a vertex
*/

namespace RAT {

  class VertexGen_DecayChain : public GLG4VertexGen {
  public:
    VertexGen_DecayChain(const char *arg_dbname="vertexchain");
    virtual ~VertexGen_DecayChain();
    virtual void GeneratePrimaryVertex( G4Event *argEvent,
					G4ThreeVector &dx,
					G4double dt);

    virtual void SetState( G4String newValues );

    virtual G4String GetState();
    // returns current state formatted as above

  private:

    // Generator initialization, specified by the user.
    G4String fStateStr;

    // The decay chain for the isotope selected by the user.
    DecayChain* fDecayChain;

    bool fInMiddle;      // to start chain from the isotope;
    bool fInAlphaDecay;  // to have only alpha decay
    bool fInGammaDecay;  // to have only gamma decay
    bool fScreenCorr;    // to use a screening correction in the beta decay
  };

} // namespace RAT

#endif